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Related Experiment Video

Updated: Feb 9, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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Ultrahigh resolution optic fiber strain sensor with a frequency-locked random distributed feedback fiber laser.

Peide Liu, Wenzhu Huang, Wentao Zhang

    Optics Letters
    |June 2, 2018
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    Summary

    This study introduces an ultrahigh resolution optic fiber strain sensor. It achieves a 140 fε/√Hz dynamic strain resolution by suppressing laser frequency noise using a novel Pound-Drever-Hall technique.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optic Sensors
    • Laser Physics

    Background:

    • Fiber optic sensors are crucial for precise measurements.
    • Laser frequency noise can limit sensor resolution.
    • Thermal fluctuations often induce significant noise in laser systems.

    Purpose of the Study:

    • To develop an ultrahigh resolution optic fiber strain sensor.
    • To suppress thermally induced frequency noise in a fiber laser.
    • To achieve unprecedented dynamic strain resolution.

    Main Methods:

    • Utilizing a random distributed feedback fiber laser (RDFL).
    • Implementing a frequency-shift Pound-Drever-Hall technique.
    • Locking the RDFL to a π-phase-shifted fiber Bragg grating to track resonant frequency changes.

    Main Results:

    • The RDFL's random distributed feedback suppressed laser frequency noise.
    • Frequency noise was reduced from 100 Hz/√Hz to 20 Hz/√Hz at 1 kHz.
    • An ultrahigh dynamic strain resolution of 140 fε/√Hz at 1 kHz was achieved.

    Conclusions:

    • The proposed technique significantly enhances fiber optic sensor performance.
    • This advancement enables highly sensitive strain measurements.
    • The method offers a new pathway for noise reduction in laser-based sensing applications.